A client with Rh-negative blood asks why she needs Rhogam. What is the purpose of the Rhogam injection?

Intrauterine resuscitation involves a set of rapid interventions designed to optimize uteroplacental perfusion and fetal oxygenation during periods of fetal distress. These maneuvers address maternal hypotension, umbilical cord compression, or uterine tachysystole. The goal is to stabilize the fetal heart rate and prevent neonatal acidemia.

A. Stop uterotonics: Discontinuing agents like oxytocin immediately reduces uterine activity, allowing longer periods of placental blood flow between contractions. Hyperstimulation compromises the intervillous space gas exchange, leading to fetal hypoxia. Reducing myometrial tension is a primary step in correcting non-reassuring fetal heart rate patterns.

B. Maternal reposition: Changing the mother to a lateral position, particularly the left side, relieves aortocaval compression by the gravid uterus. This increases venous return to the heart and enhances cardiac output. Improved maternal hemodynamics directly translate to increased oxygen delivery to the fetus through the umbilical vein.

C. Oxygen administration: Providing supplemental oxygen via a non-rebreather mask at 8 to 10 liters per minute increases the maternal-fetal oxygen gradient. This maximizes the saturation of maternal hemoglobin, ensuring that more oxygen is available for transfer across the placenta. It is a standard supportive measure during acute fetal bradycardia.

D. IV fluid bolus: An isotonic crystalloid bolus increases maternal circulating blood volume, which helps correct hypotension and improves placental blood flow. Enhanced vascular volume ensures better perfusion of the uterine arteries. This is especially critical if the distress is related to maternal dehydration or epidural-induced sympathetic blockade.

E. Increase oxytocin: This action is contraindicated during fetal distress as it further increases the frequency and intensity of contractions. Excessive uterine activity prevents adequate placental re-oxygenation between peaks, worsening fetal hypoxia and acidemia. Uterotonics should be decreased or stopped, never increased, during a resuscitation protocol.

Phenylketonuria (PKU) is an autosomal recessive disorder caused by a deficiency of the hepatic enzyme phenylalanine hydroxylase. This leads to the toxic accumulation of the amino acid phenylalanine, which causes irreversible neurological damage and intellectual disability. Screening occurs via a neonatal heel stick shortly after birth.

A. Fluid restriction: There is no physiological basis for limiting fluid intake in infants with PKU. Adequate hydration is necessary for metabolic stability and renal function. Treatment focuses on the chemical composition of the intake rather than the total volume of fluid consumed.

B. Iron supplementation: While maintaining general nutrition is important, iron does not affect the metabolic pathway of phenylalanine. PKU management is specifically concerned with amino acid metabolism rather than hematological parameters. Iron status is managed independently of a PKU diagnosis.

C. High-protein diet: Standard high-protein foods like meat, dairy, and eggs are extremely high in phenylalanine and are strictly forbidden. Consumption of these foods would lead to a rapid rise in neurotoxic levels of the amino acid. A high-protein diet is contraindicated for these patients.

D. Phenylalanine-restricted diet: The mainstay of therapy is a life-long diet that limits phenylalanine while providing enough tyrosine and other essential nutrients. This involves special medical formulas and low-protein foods to maintain blood levels within the therapeutic range. This prevents cognitive impairment.